<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
  <script src="../react18/react.development.js"></script>
  <script src="../react18/react-dom.development.js"></script>
  <script src="../react18/babel.min.js"></script>
</head>

<body>
  <div id="app"></div>
  <script type="text/babel">
    /* 
      porps是用来做父子组件通信的
        - 在父组件中使用子组件的时候,可以给子组件添加属性
        - 在子组件中组件实例的props属性上,就能拿到这个属性和值
    
    */
class Parent extends React.Component{

  state={
    name:'条条'
  }
  render(){
    const {name}=this.state
    return(
      <div>
        <Child a={name}/>
        <p>我是{name}爸</p>
      </div>
    )
  }

} 
class Child extends React.Component{

  render(){
    console.log(this)
    const {a} =this.props
    return (
      <h1>我是{a}</h1>
    )
  }
}
const root = ReactDOM.createRoot(document.getElementById('app')).render(<Parent/>)


  </script>
</body>

</html>